Erika Kohut (Isabelle Huppert) is a middle-aged piano teacher in a rut. She lives at home with her ailing mother, who doesn't treat her well, and she's unable to satisfy her sexual needs to her liking. She dabbles in watching porn and watching other couples have sex, hoping it'll entice her sexual needs, but nothing can quite scratch the itch that won't go away. Until Walter (Benoit Magimel), one of her students, walks into her life. Immediately, he shows interest in her, but as someone who has always deprived herself of her deepest fantasies, she shuts him down. Erika can only hold out so long, though.